/*
    Copyright (c) Guangzhou Data Control Network Technology Co., Ltd. All rights reserved.
    Licensed under the MIT License.
    contact:dcdev_founder@foxmail.com
*/
function insertElement(id, element, class_name = "", style = "") {
    _id = document.getElementById(id);
    if (!_id) {
        _element = document.createElement(element);
        _element.id = id;
        _element.name = id;
        _element.style.cssText = style;
        _element.className = class_name;
        document.body.appendChild(_element);
    }
}

// 将input/textarea内容设置到剪贴板（id为组件的id）
function setContentToClipboard(id) {
    elem = document.getElementById(id)
    // create hidden text element, if it doesn't already exist
    var targetId = "_hiddenCopyText_";
    var isInput = elem.tagName === "INPUT" || elem.tagName === "TEXTAREA";
    var origSelectionStart, origSelectionEnd;
    if (isInput) {
        // can just use the original source element for the selection and copy
        target = elem;
        origSelectionStart = elem.selectionStart;
        origSelectionEnd = elem.selectionEnd;
    } else {
        // must use a temporary form element for the selection and copy
        target = document.getElementById(targetId);
        if (!target) {
            var target = document.createElement("textarea");
            target.style.position = "absolute";
            target.style.left = "-9999px";
            target.style.top = "0";
            target.id = targetId;
            document.body.appendChild(target);
        }
        target.textContent = elem.textContent;
    }
    // select the content
    var currentFocus = document.activeElement;
    target.focus();
    target.setSelectionRange(0, target.value.length);
    // copy the selection
    var succeed;
    try {
        succeed = document.execCommand("copy");
    } catch (e) {
        succeed = false;
    }
    // restore original focus
    if (currentFocus && typeof currentFocus.focus === "function") {
        currentFocus.focus();
    }
    if (isInput) {
        // restore prior selection
        elem.setSelectionRange(origSelectionStart, origSelectionEnd);
    } else {
        // clear temporary content
        target.textContent = "";
    }
    return succeed;
}
// 插入一个透明隐藏的textarea
insertElement("_copy_text_", "textarea", "",
    "position:absolute;opacity:0.01;top:0px;left:0px;width:0px;height:0px")

// 将文本设置到剪贴板
function setTextToClipboard(text) {
    _element = document.getElementById("_copy_text_");
    _element.value = text;
    setContentToClipboard("_copy_text_");
}
